So the drama continues.. So quick update.. fine cold for the first few minutes.. At idle the tacho does move a little.. Once it warms up say 3 ks, it thumps and struggles to rev.. So far replaced O2 sensors, plugs and leads tried different coils all 3 and another DFI.. Tried another MAF and TPS and IAC valve.. There doesn't appear to be any vacuum leaks.. The inlet gaskets have just been done as the oil was entering the coolant.. It runs just the same after the new gaskets BUT no more oil in the coolant.. So now I have bit the bullet and ordered a new CAS and getting that fitted next Wednesday.. I noticed last nite it was rather cool coming home it was 22 degrees and the thumping and struggling was a lot less.. So it's heat related.. It's never chucked the CEL once.. Even when it thumps away at its worst.. It can't be the only Ecotec doing this ?